Rotor, motor, electric driving device, electric driving system and electric equipment

Abstract

The invention provides a rotor, a motor, an electric driving device, an electric driving system and electric equipment, the rotor comprises a rotating shaft, a rotor main body and a magnet, the rotor main body is coaxially connected with the rotating shaft, the rotor main body is provided with a mounting groove, the magnet is mounted in the mounting groove, and at least part of space in the mounting groove forms a cooling space. The cooling space is used for containing a cooling medium so that the magnet can make contact with the cooling medium. According to the rotor provided by the embodiment of the invention, at least part of the space in the mounting groove forms the cooling space, and the magnet is mounted in the mounting groove, so that the magnet is in direct contact with the cooling medium, heat in the magnet is taken away through the cooling medium, the magnet is cooled, the cooling effect of the magnet is effectively improved, and the service life of the rotor is prolonged. The heat dissipation performance of the rotor is effectively improved, and the working performance of the motor is further effectively improved.

Description

Technical Field

[0001] This application relates to the field of motor technology, specifically to a rotor, motor, electric drive device, electric drive system, and electric equipment. Background Technology

[0002] With increasing environmental pollution, new energy products are gaining popularity. Electric drive systems, as the power source for these products, convert electrical energy from batteries into mechanical energy to power them. As the core component of electric drive systems, improving the performance of the electric motor is a critical technical challenge that needs to be addressed in electric drive technology. Summary of the Invention

[0003] The purpose of this application is to provide a rotor, motor, electric drive device, electric drive system, and electric equipment to solve the technical problem of poor motor performance in related technologies.

[0004] To achieve the above objectives, the technical solution adopted in this application embodiment is: to provide a rotor, comprising:

[0005] Shaft;

[0006] The rotor body is coaxially connected to the rotating shaft, and the rotor body has an installation groove.

[0007] The magnet is installed in the mounting slot;

[0008] At least a portion of the space in the mounting slot constitutes a cooling space, which is used to contain a cooling medium so that the magnet comes into contact with the cooling medium.

[0009] The rotor provided in this application embodiment has at least the following beneficial effects: The rotor provided in this application embodiment forms a cooling space in at least a portion of the space in the mounting slot and installs the magnet in the mounting slot so that the magnet is in direct contact with the cooling medium, thereby removing the heat from the magnet through the cooling medium, thus achieving cooling of the magnet, effectively improving the cooling effect of the magnet, effectively improving the heat dissipation performance of the rotor, and thus effectively improving the working performance of the motor.

[0010] In some embodiments of this application, the rotor has an input channel that connects to a cooling space to deliver a cooling medium into the cooling space.

[0011] By adopting the above technical solution, it is easy to transport the cooling medium into the cooling space, thereby achieving the cooling of the magnet.

[0012] In some embodiments of this application, a first cooling channel is formed inside the rotating shaft.

[0013] By adopting the above technical solution, a portion of the heat from the magnet can be transferred to the cooling medium in the cooling space, while another portion of the heat from the magnet can be transferred to the cooling medium in the first cooling channel through the rotor body and shaft. This further improves the cooling effect of the magnet, enhances the heat dissipation performance of the rotor, and thus further improves the working performance of the motor.

[0014] In some embodiments of this application, the input channel further includes a second cooling channel formed inside the rotor body, which is used to connect the first cooling channel and the cooling space.

[0015] By adopting the above technical solution, the cooling medium can flow through the shaft, rotor body and magnet, further improving the heat dissipation performance of the rotor, thereby further improving the working performance of the motor.

[0016] In some embodiments of this application, the input channel further includes a first via, which is formed on the wall of the rotating shaft and is used to connect the first cooling channel and the second cooling channel.

[0017] By adopting the above technical solution, it is easy to connect the first cooling channel and the second cooling channel.

[0018] In some embodiments of this application, the wall of the rotating shaft is provided with a second through hole for connecting the first cooling channel and the external environment of the rotor. The rotor also includes a spray member installed in the second through hole to spray the cooling medium located in the first cooling channel onto the outer surface of the magnet.

[0019] By adopting the above technical solution, the cooling medium located in the cooling space and the cooling medium sprayed from the spraying component can absorb the heat of the magnet, further improving the cooling effect of the magnet, further enhancing the heat dissipation performance of the rotor, and thus further improving the working performance of the motor.

[0020] In some embodiments of this application, the spraying element is an atomizing nozzle.

[0021] By adopting the above technical solution, the coverage area of ​​the cooling medium sprayed from the jet component can be increased, the contact area between the magnet and the cooling medium sprayed from the jet component can be increased, the cooling effect of the magnet can be further improved, the heat dissipation performance of the rotor can be further enhanced, and thus the working performance of the motor can be further improved.

[0022] In some embodiments of this application, the second through hole is located on the axial side of the rotor body.

[0023] By adopting the above technical solution, it is not only convenient to install the spray component into the second through hole, but also convenient to spray the cooling medium onto the magnet, effectively simplifying the overall structure of the rotor.

[0024] In some embodiments of this application, the rotor body has a first outlet, which is used to connect the cooling space and the external environment of the rotor.

[0025] By adopting the above technical solution, during the rotation of the rotor, the cooling medium can be thrown out from the first outlet to the outside of the rotor body under the action of centrifugal force, which facilitates the alternating flow of the cooling medium in the cooling space.

[0026] In some embodiments of this application, the rotor body is provided with a blocking portion at the first outlet.

[0027] By adopting the above technical solution, the blocking part can play a certain role in blocking the cooling medium flowing through the first outlet, effectively reducing the flow rate of the cooling medium, thereby effectively improving the situation where other parts of the rotor are damaged by the impact of the cooling medium. In addition, it can also extend the residence time of the cooling medium in the cooling space, so that the cooling medium can better absorb the heat of the magnet, further improving the cooling effect of the magnet, further improving the heat dissipation performance of the rotor, and thus further improving the working performance of the motor.

[0028] In some embodiments of this application, the first outlet is located on the outer periphery of the rotor body.

[0029] By adopting the above technical solution, it is easy to discharge the cooling medium to the external environment of the rotor body.

[0030] In some embodiments of this application, the wall of the mounting groove is provided with a third cooling channel, and the internal space of the third cooling channel constitutes a cooling space.

[0031] By adopting the above technical solution, it is easy to form a cooling space within the installation slot.

[0032] In some embodiments of this application, the third cooling channel has a curved structure.

[0033] By adopting the above technical solution, the flow rate of the cooling medium is effectively reduced, and the residence time of the cooling medium in the third cooling channel is extended, so that the cooling medium can better absorb the heat of the magnet, further improving the cooling effect of the magnet, further enhancing the heat dissipation performance of the rotor, and thus further improving the working performance of the motor.

[0034] In some embodiments of this application, the third cooling channel is recessed in the bottom wall of the mounting groove; and / or, the third cooling channel is recessed in the side wall of the mounting groove.

[0035] By adopting the above technical solution, it is easy to set up a third cooling channel in the installation slot.

[0036] In some embodiments of this application, the magnet is separated from the wall of the mounting slot to form a cooling space.

[0037] By adopting the above technical solution, it is easy to form a cooling space within the installation slot.

[0038] In some embodiments of this application, the outer peripheral wall of the magnet is sealed to the inner peripheral wall of the mounting groove.

[0039] By adopting the above technical solution, the leakage of cooling medium from the cooling space to the external environment of the rotor body is effectively improved, the cooling effect of the magnet is further improved, the heat dissipation performance of the rotor is further enhanced, and thus the working performance of the motor is further improved.

[0040] In some embodiments of this application, the magnet is separated from the bottom wall of the mounting groove to form at least a portion of the cooling space; and / or, the magnet is separated from the side wall of the mounting groove to form at least a portion of the cooling space.

[0041] By adopting the above technical solution, it is easy to form a cooling space within the installation slot.

[0042] In some embodiments of this application, the rotor further includes a liquid collecting ring, which includes an annular body. The annular body is sleeved on the outer periphery of the rotor body, and the annular body has a second outlet for connecting the inner annular space of the annular body and the external environment of the annular body.

[0043] By adopting the above technical solution, it is convenient to collect the cooling medium discharged from the rotor body, effectively reduce the oil churning loss of the rotor, effectively improve the working efficiency of the motor, and thus further improve the working performance of the motor.

[0044] In some embodiments of this application, the liquid collecting ring further includes an adsorption element attached to the inner peripheral wall of the ring body to adsorb the cooling medium.

[0045] By adopting the above technical solution, the adsorption component can adsorb the cooling medium discharged from the rotor body, further reduce the oil churning loss of the rotor, further improve the working efficiency of the motor, and thus further improve the working performance of the motor.

[0046] In some embodiments of this application, the liquid collecting ring further includes a first liquid guiding structure disposed on the inner peripheral wall of the annular body to guide the cooling medium to the second outlet.

[0047] By adopting the above technical solution, the first liquid guiding structure can guide the cooling medium to the second outlet, thereby effectively improving the discharge efficiency of the cooling medium.

[0048] In some embodiments of this application, the first liquid guiding structure includes a first guiding portion and a second guiding portion. The first guiding portion and the second guiding portion are separated along the axial direction of the rotor to form a first liquid guiding gap. In the circumferential direction of the annular body, the first guiding portion and the second guiding portion are gradually moved closer to each other in the direction of the second outlet.

[0049] By adopting the above technical solution, the structure of the first liquid guiding structure is effectively simplified, making it easier to guide the cooling medium to the second outlet.

[0050] In some embodiments of this application, there are multiple first liquid guiding structures, which are arranged sequentially along the circumference of the annular body.

[0051] By adopting the above technical solution, the cooling medium is guided to the second outlet more effectively, thereby further improving the discharge efficiency of the cooling medium.

[0052] In some embodiments of this application, the liquid collecting ring further includes a second liquid guiding structure. The second liquid guiding structure is disposed on the inner peripheral wall of the annular body and located on the side of the second outlet opposite to the first liquid guiding structure. The first liquid guiding structure is used to guide a portion of the cooling medium to the second outlet, and the second liquid guiding structure is used to guide another portion of the cooling medium to the second outlet.

[0053] By adopting the above technical solution, the cooling medium is guided to the second outlet more effectively, thereby further improving the discharge efficiency of the cooling medium.

[0054] In some embodiments of this application, the second liquid guiding structure includes a third guiding portion and a fourth guiding portion. The third guiding portion and the fourth guiding portion are separated along the axial direction of the rotor to form a second liquid guiding gap. In the circumferential direction of the annular body, the third guiding portion and the fourth guiding portion are gradually arranged closer to each other in the direction of the second outlet.

[0055] By adopting the above technical solution, the structure of the second liquid guiding structure is effectively simplified, making it easier to guide the cooling medium to the second outlet.

[0056] In some embodiments of this application, there are multiple second liquid guiding structures, which are arranged sequentially around the circumference of the annular body.

[0057] By adopting the above technical solution, the cooling medium is guided to the second outlet more effectively, thereby further improving the discharge efficiency of the cooling medium.

[0058] In some embodiments of this application, the second outlet is located at the bottom of the annular body.

[0059] By adopting the above technical solution, the cooling medium can flow to the second outlet under its own gravity, thereby further improving the discharge efficiency of the cooling medium.

[0060] This application also provides an electric motor, including the rotor described in any of the above embodiments.

[0061] The motor provided in this application embodiment has at least the following beneficial effects: the motor provided in this application embodiment effectively improves the working performance of the motor by adopting the rotor described in any of the above embodiments.

[0062] This application also provides an electric drive device, including the motor described above.

[0063] The electric drive device provided in this application embodiment has at least the following beneficial effects: the electric drive device provided in this application embodiment effectively improves the working performance of the electric drive device by adopting the above-mentioned motor.

[0064] This application also provides an electric drive system, including a battery and the above-mentioned electric drive device, wherein the battery is electrically connected to a motor.

[0065] The electric drive system provided in this application embodiment has at least the following beneficial effects: the electric drive system provided in this application embodiment effectively improves the working performance of the electric drive system by adopting the above-mentioned electric drive device.

[0066] This application also provides an electric device, including the above-described electric drive device or the above-described electric drive system.

[0067] The electric equipment provided in this application embodiment has at least the following beneficial effects: the electric equipment provided in this application embodiment effectively improves the working performance of the electric equipment by adopting the above-mentioned electric drive device or the above-mentioned electric drive system. Attached Figure Description

[0068] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0069] Figure 1 This is a schematic diagram of the vehicle structure provided in an embodiment of this application;

[0070] Figure 2 This is a schematic diagram of the exploded structure of a battery provided in an embodiment of this application;

[0071] Figure 3 This is a schematic diagram of the structure of the electric drive device provided in the embodiments of this application;

[0072] Figure 4This is a schematic diagram of the structure of the motor provided in an embodiment of this application;

[0073] Figure 5 for Figure 4 The diagram shows a cross-sectional view of the motor along line AA.

[0074] Figure 6 This is a schematic diagram of the rotor structure after the liquid collecting ring is removed, according to an embodiment of this application;

[0075] Figure 7 for Figure 6 The diagram shows the main structural view of the rotor.

[0076] Figure 8 for Figure 7 The schematic diagram of the cross-sectional structure of the rotor along the BB line is shown.

[0077] Figure 9 for Figure 6 The diagram shows the structure of the rotor body in the rotor shown.

[0078] Figure 10 A schematic diagram of the rotor provided in another embodiment of this application;

[0079] Figure 11 This is a schematic diagram of the liquid collection ring provided in an embodiment of this application;

[0080] Figure 12 for Figure 11 The diagram shows the front view of the liquid collection ring.

[0081] Figure 13 for Figure 12 The diagram shows a cross-sectional view of the liquid collecting ring along the CC line.

[0082] The following are the labeling elements in the figure:

[0083] 1. Electric drive device;

[0084] 10. Motor; 11. Housing; 111. Cavity; 12. Rotor; 121. Shaft; 1211. First cooling channel; 1212. First through hole; 1213. Second through hole; 122. Rotor body; 1221. Mounting slot; 1222. Cooling space; 1223. Second cooling channel; 1224. Third cooling channel; 1225. First outlet; 12251. Sub-outlet; 1226. Blocking part ; 123. Magnet; 124. Spray component; 125. Liquid collecting ring; 1251. Annular body; 12511. Second outlet; 1252. Adsorption component; 1253. First liquid guiding structure; 12531. First guide part; 12532. Second guide part; 12533. First liquid guiding gap; 1254. Second liquid guiding structure; 126. Input channel; 13. Stator; 20. Controller; 30. Speed ​​change mechanism;

[0085] 2. Battery;

[0086] 21. Box body; 211. First part; 212. Second part;

[0087] 22. Battery cell;

[0088] 3. Vehicle body. Detailed Implementation

[0089] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0090] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0091] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0092] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," "third," or "fourth" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0093] An electric motor is the power unit of an electric device. It is used to convert electrical energy into mechanical energy to drive the operation of the electric device.

[0094] An electric motor typically consists of a stator and a rotor. The stator usually includes an iron core and windings, with the windings wound around the iron core. The rotor typically includes a rotor body, magnets, and a shaft. The rotor body is coaxially connected to the shaft, and the magnets are mounted on the rotor body. During motor operation, current flows through the stator windings, generating a rotating magnetic field. The rotor, situated within this rotating magnetic field, rotates due to the interaction between this field and the magnetic field of the magnets, causing the rotor body to rotate synchronously, thus driving the shaft to rotate synchronously. During rotor rotation, significant losses occur, such as windage losses, eddy current losses, and harmonic losses. These losses are converted into heat, accumulating within the rotor and causing its temperature to rise. If the rotor temperature becomes too high, the magnets may undergo irreversible demagnetization, leading to a decrease in motor performance. Therefore, cooling of the magnets is necessary.

[0095] In related technologies, there are various methods for cooling magnets. For example, a cooling channel is set inside the shaft, and a cooling medium flows within the channel to absorb the rotor's heat. However, because the heat from the magnet needs to be transferred through the rotor body and shaft to the cooling medium in the cooling channel, the heat conduction path is long and the heat conduction efficiency is low, resulting in poor cooling of the magnet. Another method is to immerse at least a portion of the rotor in a cooling medium, allowing direct contact between the rotor and the cooling medium. The heat from the magnet can be transferred through the rotor body to the cooling medium, or the magnet can directly contact the cooling medium, thus achieving cooling of the magnet. However, when the rotor rotates at high speed, the immersion of at least a portion of the rotor in the cooling medium leads to significant oil churning losses, further exacerbating the rotor's heating. Therefore, the cooling methods currently used are ineffective, failing to meet the cooling requirements of the magnet and hindering the improvement of motor performance.

[0096] To improve the working performance of the motor, the rotor provided in this application embodiment forms a cooling space in at least part of the space in the mounting slot, and the magnet is installed in the mounting slot so that the magnet is in direct contact with the cooling medium. The cooling medium removes the heat from the magnet, thereby cooling the magnet and effectively improving the cooling effect of the magnet. This effectively improves the heat dissipation performance of the rotor, and thus effectively improves the working performance of the motor.

[0097] The technical solutions described in this application are applicable to electric drive devices using motors and electric equipment using electric drive devices. The electric equipment can be, but is not limited to, vehicles, ships, spacecraft, and electric toys, etc. Vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as electric car toys, electric ship toys, and electric airplane toys, etc.

[0098] For ease of explanation, the following embodiments will use a vehicle as an example of the electric device in one embodiment of this application.

[0099] Please see Figure 1 , Figure 1 This is a schematic diagram of the vehicle structure provided in an embodiment of this application. The vehicle includes a body 3, a battery 2, and an electric drive unit 1. The body 3 is the main supporting component of the vehicle, and has an engine compartment and a passenger compartment. The engine compartment houses the electric drive unit 1, and the passenger compartment provides operating and seating space for the driver and passengers. When the vehicle is a front-wheel drive vehicle, the engine compartment is located at the front of the body 3, i.e., the engine compartment is the front engine compartment; when the vehicle is a rear-wheel drive vehicle, the engine compartment is located at the rear of the body 3, i.e., the engine compartment is the rear engine compartment; when the vehicle is a four-wheel drive vehicle, the engine compartment is divided into a front engine compartment and a rear engine compartment, with the front engine compartment located at the front of the body 3 and the rear engine compartment located at the rear of the body 3. There can be two electric drive units 1, one in the front engine compartment and one in the rear engine compartment. The battery 2 and the electric drive unit 1 together constitute the vehicle's electric drive system. The battery 2 can be located at the bottom, front, or rear of the vehicle, and the battery 2 can supply power to the electric drive unit 1 to drive its operation. The electric drive unit 1 is used to convert the electrical energy provided by the battery 2 into mechanical energy and output the mechanical energy to the wheels of the vehicle to drive the vehicle.

[0100] Please see Figure 2 , Figure 2This is an exploded view of a battery 2 provided in an embodiment of this application. The battery 2 includes a housing 21 and a battery cell 22, with the battery cell 22 housed within the housing 21. The housing 21 provides a space for the battery cell 22 and can have various structures. In some embodiments, the housing 21 may include a first portion 211 and a second portion 212, which overlap each other, jointly defining a space for accommodating the battery cell 22. The second portion 212 may be a hollow structure with one open end, while the first portion 211 may be a plate-like structure, covering the open side of the second portion 212 so that the first portion 211 and the second portion 212 jointly define the space. Alternatively, both the first portion 211 and the second portion 212 may be hollow structures with one open side, with the open side of the first portion 211 covering the open side of the second portion 212, so that the first portion 211 and the second portion 212 jointly define the space. Of course, the box 21 formed by the first part 211 and the second part 212 can be of various shapes, such as cylinder, cuboid, etc., and no specific limitation is made here.

[0101] In some embodiments, the housing 21 may be part of the vehicle's chassis structure. For example, a portion of the housing 21 may be at least a portion of the vehicle's floor, or a portion of the housing 21 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0102] Of course, in some embodiments, the battery 2 may not include the housing 21, but rather multiple battery cells 22 are electrically connected and assembled into the vehicle after being formed into a whole by necessary fixing structures.

[0103] In battery 2, there can be multiple battery cells 22, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 22 are connected in both series and parallel configurations. Multiple battery cells 22 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 22 is housed within the casing 21. Alternatively, battery 2 can also consist of multiple battery cells 22 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the casing 21. Battery 2 may also include other functional components; for example, it may include a busbar for electrical connection between the multiple battery cells 22.

[0104] Each battery cell 22 can be a secondary battery cell or a primary battery cell. A secondary battery cell refers to a battery cell 22 that can be recharged to activate its active materials and continue to be used after being discharged. A primary battery cell refers to a battery cell 22 that cannot be recharged to activate its active materials and continue to be used after its electrical energy is depleted. The battery cell 22 can also be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., but is not limited thereto. The battery cell 22 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell 22 of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells, etc. This application does not have any particular limitations.

[0105] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of the electric drive device 1 provided in an embodiment of this application. The electric drive device 1 includes a motor 10, which converts the electrical energy provided by the battery 2 into mechanical energy. For details, please refer to the following: Figure 4 and Figure 5 The motor 10 includes a stator 13 and a rotor 12. During operation, current flows through the windings of the stator 13, generating a rotating magnetic field. Under the influence of this rotating magnetic field, the rotor 12 rotates, thereby converting electrical energy into mechanical energy and outputting that mechanical energy. The motor 10 can be, but is not limited to, an axial flux motor, a radial flux motor, a servo motor, a brushed motor, or a brushless motor. In some embodiments, the motor 10 is an axial flux motor. For example, please refer to [reference needed]. Figure 5 The motor 10 has two stators 13, which are located on opposite sides of the rotor 12 along the axial direction of the motor 10. As an example, the motor 12 also has two rotors, which are located on opposite sides of the stators 13 along the axial direction of the motor 10. In some embodiments, the motor 10 has two motors 10, which are coaxially arranged, meaning their central axes coincide. The "central axis" of the motor 10 refers to the axial center line of the rotating shaft 121 (or "rotor shaft") of the motor 10. As an example, the rotating shaft 121 of one motor 10 is connected to one of the left and right front wheels of the vehicle, and the rotating shaft 121 of the other motor 10 is connected to the other of the left and right front wheels of the vehicle; or, the rotating shaft 121 of one motor 10 is connected to one of the left and right rear wheels of the vehicle, and the rotating shaft 121 of the other motor 10 is connected to the other of the left and right rear wheels of the vehicle. During the operation of the electric drive device 1, the two motors 10 can rotate at the same speed or at different speeds.

[0106] Of course, in other embodiments, the number of motors 10 may also be one.

[0107] In some embodiments, the electric drive device 1 may further include a controller 20. The controller 20 is used to convert the direct current output by the battery 2 into alternating current and transmit the alternating current to the motor 10. The controller 20 may also be used to control the operation of the motor 10, for example, to control the start / stop, speed, torque, etc. of the motor 10. In other words, both the motor 10 and the battery 2 are electrically connected to the controller 20. The direct current output by the battery 2 can be transmitted to the controller 20 through the current transmission path between the battery 2 and the controller 20. After the controller 20 converts the direct current into alternating current, the alternating current can be transmitted to the motor 10 through the current transmission path between the controller 20 and the motor 10 to drive the motor 10 to operate. At the same time, the control signal of the controller 20 can be transmitted to the motor 10 through the current transmission path between the controller 20 and the motor 10, and the operating status signal of the motor 10 can be transmitted to the controller 20 through the current transmission path between the controller 20 and the motor 10 to realize the controller 20 controlling the operation of the motor 10.

[0108] In some embodiments, the electric drive device 1 may further include a transmission mechanism 30, which transmits the mechanical energy to the vehicle wheels by changing the rotational speed and torque of the motor 10. For example, the transmission mechanism 30 transmits the mechanical energy to the vehicle wheels by decreasing the rotational speed of the motor 10 and increasing the torque of the motor 10; or, for instance, the transmission mechanism 30 transmits the mechanical energy to the vehicle wheels by increasing the rotational speed of the motor 10 and decreasing the torque of the motor 10. The transmission mechanism 30 may be, but is not limited to, a gear transmission mechanism, a worm gear transmission mechanism, a planetary gear transmission mechanism, a continuously variable transmission mechanism, etc.

[0109] To illustrate the technical solutions provided in this application, the following detailed description is provided in conjunction with specific drawings and embodiments.

[0110] Firstly, please refer to the following: Figures 6 to 10 This application provides a rotor 12, including a shaft 121, a rotor body 122, and a magnet 123. The rotor body 122 is coaxially connected to the shaft 121, and the rotor body 122 has a mounting groove 1221, in which the magnet 123 is mounted. At least a portion of the space in the mounting groove 1221 constitutes a cooling space 1222, which is used to contain a cooling medium so that the magnet 123 comes into contact with the cooling medium.

[0111] The rotor body 122 is a component used to fix and support the magnet 123. The rotor body 122 can be made of a high-strength material, which can be, but is not limited to, low-carbon steel, stainless steel, bakelite, nylon, etc. The rotor body 122 can be a one-piece molded component; for example, it can be integrally molded using a casting process. The rotor body 122 can also comprise multiple components, each individually molded and then connected to form a whole.

[0112] In some embodiments, when the motor 10 is an axial flux motor, the rotor body 122 may have a disc-shaped structure.

[0113] In some other embodiments, when the motor 10 is a radial flux motor, the rotor body 122 may have a cylindrical structure.

[0114] The rotating shaft 121 is a component used to output the mechanical energy generated by the rotation of the rotor body 122. The rotor body 122 and the rotating shaft 121 are coaxially arranged, meaning that the central axis of the rotor body 122 is parallel to and coincides with the central axis of the rotating shaft 121. Of course, considering the existence of manufacturing tolerances, there may be a slight deviation between the central axis of the rotor body 122 and the central axis of the rotating shaft 121.

[0115] Magnet 123 is a component used to generate a magnetic field. Magnet 123 can be made of permanent magnet material, which can be, but is not limited to, neodymium iron boron, cobalt, and alnico. During the operation of motor 10, current flows through the windings of stator 13, causing the windings to generate a rotating magnetic field. Under the interaction of the magnetic field of magnet 123 and this rotating magnetic field, rotor body 122 rotates, thereby driving shaft 121 to rotate synchronously.

[0116] Mounting groove 1221 provides mounting space for magnet 123. In some embodiments, mounting groove 1221 is recessed on the outer wall surface of rotor body 122. As an example, in the case of motor 10 being an axial flux motor, mounting groove 1221 may be recessed on the end face of rotor body 122. As an example, in the case of motor 10 being a radial flux motor, mounting groove 1221 may be recessed on the outer peripheral wall of rotor body 122. In some embodiments, the shape of mounting groove 1221 is adapted to the shape of magnet 123 so that the outer wall surface of magnet 123 and the groove wall of mounting groove 1221 can substantially fit together, thereby achieving relative fixation between magnet 123 and rotor body 122. "Substantially fit together" means that, in the presence of manufacturing tolerances, most of the outer wall surface of magnet 123 fits together with most of the groove wall of mounting groove 1221, while a small portion of the outer wall surface of magnet 123 and a small portion of the groove wall of mounting groove 1221 have minute gaps.

[0117] In some embodiments, the magnet 123 may be bonded to the mounting groove 1221. As an example, an adhesive may be applied to the outer wall of the magnet 123 and / or the groove wall of the mounting groove 1221, and after the magnet 123 is assembled into the mounting groove 1221, the magnet 123 and the groove wall of the mounting groove 1221 may be bonded together by the adhesive.

[0118] In some embodiments, there are multiple magnets 123, which are arranged at intervals around the central axis of the rotating shaft 121, with equal spacing between any two adjacent magnets 123. Correspondingly, there are also multiple mounting slots 1221, with each magnet 123 corresponding to one of the multiple mounting slots 1221.

[0119] The cooling space 1222 is at least a portion of the internal space of the mounting slot 1221. The cooling space 1222 is used to contain the cooling medium. After the magnet 123 is installed into the mounting slot 1221, the cooling medium in the cooling space 1222 can directly contact the magnet 123.

[0120] The cooling medium is used to absorb the heat generated by the rotor 12. The cooling medium can be stationary within the cooling space 1222, or it can enter the cooling space 1222 during circulation. Optionally, the cooling medium can be, but is not limited to, cooling oil, cooling water, etc., and is not specifically limited here.

[0121] In some embodiments, the motor 10 is an axial flux motor, the rotor body 122 has a disc-shaped structure, the rotor body 122 has a first end face and a second end face that are arranged opposite to each other along the axial direction of the rotating shaft 121, and both the first end face and the second end face are recessed with mounting grooves 1221. Magnets 123 are installed in the mounting grooves 1221 on the first end face and the mounting grooves 1221 on the second end face. At least a portion of the space in the mounting grooves 1221 on the first end face and at least a portion of the space in the mounting grooves 1221 on the second end face constitute the aforementioned cooling space 1222.

[0122] The rotor 12 provided in this application embodiment forms a cooling space 1222 in at least a portion of the space in the mounting groove 1221, and the magnet 123 is installed in the mounting groove 1221 so that the magnet 123 is in direct contact with the cooling medium. The cooling medium removes the heat from the magnet 123, thereby cooling the magnet 123, effectively improving the cooling effect of the magnet 123, effectively improving the heat dissipation performance of the rotor 12, and thus effectively improving the working performance of the motor 10.

[0123] Please refer to some embodiments of this application as well. Figure 8 and Figure 10The rotor 12 has an input channel 126 that connects to the cooling space 1222 to deliver the cooling medium into the cooling space 1222.

[0124] The input channel 126 is used to provide a delivery path for delivering the cooling medium to the cooling space 1222. Understandably, the input channel 126 can connect the cooling space 1222 and the liquid supply device, which inputs the cooling medium into the input channel 126, and then the cooling medium flows into the cooling space 1222 along the input channel 126.

[0125] In some embodiments, a hollow structure may be provided inside the rotor 12 to form the input channel 126.

[0126] In other embodiments, a conduit may be provided outside the rotor 12 to form the input channel 126.

[0127] By adopting the above technical solution, it is easy to transport the cooling medium into the cooling space 1222, thereby achieving the cooling of the magnet 123.

[0128] Please refer to some embodiments of this application as well. Figure 8 and Figure 10 A first cooling channel 1211 is formed inside the rotating shaft 121.

[0129] The first cooling channel 1211 is used to provide a flow path for the cooling medium within the rotating shaft 121. In some embodiments, the first cooling channel 1211 may be straight and extend in a direction parallel to the central axis of the rotating shaft 121. Of course, in other embodiments, the first cooling channel 1211 may also be curved, or it may be straight and extend obliquely relative to the central axis of the rotating shaft 121.

[0130] Understandably, at least a portion of the cooling medium in the first cooling channel 1211 can enter the cooling space 1222 through the necessary communication structure.

[0131] In some embodiments, the first cooling channel 1211 passes through one end of the rotating shaft 121 to form an inlet. The cooling medium enters the first cooling channel 1211 through the inlet and then enters the cooling space 1222 through the first cooling channel 1211 to cool the magnet 123.

[0132] In other embodiments, the first cooling channel 1211 passes through one end of the rotating shaft 121 to form an inlet and passes through the other end of the rotating shaft 121 to form an outlet. The cooling medium enters the first cooling channel 1211 through the inlet, and then a portion of the cooling medium enters the cooling space 1222 through the first cooling channel 1211 to cool the magnet 123. Another portion of the cooling medium is discharged to the external environment of the rotor 12 through the outlet to remove the heat from the rotating shaft 121.

[0133] By adopting the above technical solution, a portion of the heat from the magnet 123 can be transferred to the cooling medium in the cooling space 1222, and another portion of the heat from the magnet 123 can be transferred to the cooling medium in the first cooling channel 1211 through the rotor body 122 and the shaft 121, which further improves the cooling effect of the magnet 123, further enhances the heat dissipation performance of the rotor 12, and thus further improves the working performance of the motor 10.

[0134] Please refer to some embodiments of this application as well. Figure 8 and Figure 10 The input channel 126 also includes a second cooling channel 1223, which is formed inside the rotor body 122 and is used to connect the first cooling channel 1211 and the cooling space 1222.

[0135] The second cooling channel 1223 connects the first cooling channel 1211 and the cooling space 1222. In some embodiments, the second cooling channel 1223 may be straight and extend radially parallel to the rotor body 122. Of course, in other embodiments, the second cooling channel 1223 may also be curved, or it may be straight and extend radially inclined relative to the rotor body 122.

[0136] The second cooling channel 1223 connects the first cooling channel 1211 and the cooling space 1222, meaning that at least a portion of the cooling medium in the first cooling channel 1211 can enter the cooling space 1222 through the second cooling channel 1223.

[0137] In some embodiments, the rotor body 122 has a plurality of mounting slots 1221, which are arranged around the central axis of the rotating shaft 121. At least a portion of the space in each mounting slot 1221 constitutes the aforementioned cooling space 1222. A plurality of second cooling channels 1223 are formed inside the rotor body 122. One end of each of the plurality of second cooling channels 1223 is connected to a first cooling channel 1211, and the other end of each of the plurality of second cooling channels 1223 is connected to the cooling spaces 1222 in the plurality of mounting slots 1221 in a corresponding manner.

[0138] By adopting the above technical solution, the cooling medium can flow through the rotating shaft 121, the rotor body 122 and the magnet 123, which further improves the heat dissipation performance of the rotor 12, thereby further improving the working performance of the motor 10.

[0139] Please refer to some embodiments of this application as well. Figure 8 and Figure 10 The input channel 126 also includes a first through hole 1212, which is formed on the wall of the rotating shaft 121. The first through hole 1212 is used to connect the first cooling channel 1211 and the second cooling channel 1223.

[0140] The first through-hole 1212 refers to the hole that penetrates the inner and outer sides of the wall of the rotating shaft 121. At least a portion of the cooling medium in the first cooling channel 1211 passes through the first through-hole 1212 and the second cooling channel 1223 in sequence before entering the cooling space 1222 to cool the magnet 123. The shape of the first through-hole 1212 can be, but is not limited to, circular, square, triangular, etc.

[0141] In some embodiments, when a plurality of second cooling channels 1223 are formed inside the rotor body 122, the number of first through holes 1212 is also plurality of, and the plurality of first through holes 1212 are connected to the plurality of second cooling channels 1223 in a one-to-one correspondence.

[0142] By adopting the above technical solution, it is convenient to connect the first cooling channel 1211 and the second cooling channel 1223.

[0143] Please refer to some embodiments of this application as well. Figure 8 and Figure 10 The wall of the rotating shaft 121 is provided with a second through hole 1213. The second through hole 1213 is used to connect the first cooling channel 1211 and the external environment of the rotor 12. The rotor 12 also includes a spray member 124, which is installed in the second through hole 1213 to spray the cooling medium located in the first cooling channel 1211 onto the outer surface of the magnet 123.

[0144] The second through hole 1213 refers to the hole that penetrates the inner and outer sides of the wall of the rotating shaft 121. The second through hole 1213 connects the first cooling channel 1211 and the external environment of the rotor 12, meaning that at least a portion of the cooling medium in the first cooling channel 1211 can flow out to the external environment of the rotor 12 through the second through hole 1213.

[0145] The spray element 124 is installed within the second through hole 1213 and is used to spray the cooling medium flowing through the second through hole 1213 onto the surface of the magnet 123. In some embodiments, a spray channel is formed inside the spray element 124, and the flow area of ​​the spray channel is smaller than the flow area of ​​the second through hole 1213 to increase the flow pressure of the cooling medium, thereby spraying the cooling medium onto the outer surface of the magnet 123. It should be noted that the outer surface of the magnet 123 refers to the surface exposed outside the internal space of the mounting groove 1221. The shape of the second through hole 1213 is adapted to the outer peripheral contour shape of the spray element 124. The shape of the second through hole 1213 can be, but is not limited to, circular, square, triangular, etc. In some embodiments, a sealing element is provided between the spray element 124 and the hole wall of the second through hole 1213 to seal the connection between the spray element 124 and the hole wall of the second through hole 1213, thereby blocking the gap between the spray element 124 and the hole wall of the second through hole 1213.

[0146] In some embodiments, the number of magnets 123 and the number of ejectors 124 are both multiple. The rotor body 122 has multiple mounting slots 1221, which are arranged around the central axis of the rotating shaft 121. The wall of the rotating shaft 121 has multiple second through holes 1213. The multiple magnets 123 are arranged in a one-to-one correspondence with the multiple mounting slots 1221, and the multiple ejectors 124 are arranged in a one-to-one correspondence with the multiple second through holes 1213. The multiple ejectors 124 are also arranged in a one-to-one correspondence with the multiple magnets 123.

[0147] In some embodiments, the motor 10 is an axial flux motor, the rotor body 122 has a disc-shaped structure, the mounting groove 1221 is recessed on the end face of the rotor body 122, the magnet 123 is installed in the mounting groove 1221, and the spray element 124 and the magnet 123 are arranged opposite to each other along the radial direction of the rotor body 122 so as to spray the cooling medium from the spray element 124 onto the outer surface of the magnet 123.

[0148] By adopting the above technical solution, the cooling medium located in the cooling space 1222 and the cooling medium sprayed from the sprayer 124 can respectively absorb the heat of the magnet 123, further improving the cooling effect of the magnet 123, further improving the heat dissipation performance of the rotor 12, and thus further improving the working performance of the motor 10.

[0149] In some embodiments of this application, the spray element 124 is an atomizing nozzle.

[0150] In other words, the cooling medium can be transformed from a liquid fluid into mist particles after flowing through the spray nozzle 124.

[0151] By adopting the above technical solution, the coverage area of ​​the cooling medium sprayed from the sprayer 124 can be increased, the contact area between the magnet 123 and the cooling medium sprayed from the sprayer 124 can be increased, the cooling effect of the magnet 123 can be further improved, the heat dissipation performance of the rotor 12 can be further improved, and thus the working performance of the motor 10 can be further improved.

[0152] Please refer to some embodiments of this application as well. Figure 8 and Figure 10 The second through hole 1213 is located on the axial side of the rotor body 122.

[0153] In other words, the second through hole 1213 is located on one side of the rotor body 122 along the axial direction of the shaft 121.

[0154] In some embodiments, the motor 10 is an axial flux motor, the rotor body 122 is a disc-shaped structure, the rotor body 122 has a first end face and a second end face that are arranged opposite to each other along the axial direction of the shaft 121, the first end face and the second end face are both recessed with mounting grooves 1221, the mounting grooves 1221 on the first end face and the mounting grooves 1221 on the second end face are both equipped with magnets 123, the number of spray elements 124 is multiple, the wall of the shaft 121 is provided with multiple second through holes 1213, a part of the second through holes 1213 is located on the side of the first end face away from the second end face, and another part of the second through holes 1213 is located on the side of the second end face away from the first end face, and the multiple spray elements 124 are arranged one-to-one with the multiple second through holes 1213.

[0155] By adopting the above technical solution, it is not only convenient to install the spray component 124 into the second through hole 1213, but also convenient to spray the cooling medium onto the magnet 123, effectively simplifying the overall structure of the rotor 12.

[0156] In some embodiments of this application, please refer to Figure 6 The rotor body 122 has a first outlet 1225, which is used to connect the cooling space 1222 and the external environment of the rotor 12.

[0157] The first outlet 1225 connecting the cooling space 1222 and the external environment of the rotor 12 means that at least a portion of the cooling medium in the cooling space 1222 can flow out to the external environment of the rotor 12 via the first outlet 1225. When the rotor body 122 has multiple mounting slots 1221, and at least a portion of the space in each mounting slot 1221 constitutes the aforementioned cooling space 1222, the number of first outlets 1225 can be one, with multiple cooling spaces 1222 connected to one first outlet 1225. Alternatively, the number of first outlets 1225 can be multiple, with each first outlet 1225 connected to at least one cooling space 1222. For example, multiple first outlets 1225 may be connected to multiple cooling spaces 1222 in a one-to-one correspondence; for example, every two cooling spaces 1222 may be connected to one first outlet 1225.

[0158] In some embodiments, a first cooling channel 1211 is formed inside the rotating shaft 121, a first through hole 1212 is provided in the wall of the rotating shaft 121, a second cooling channel 1223 is formed inside the rotor body 122, the first through hole 1212 is used to connect the first cooling channel 1211 and the second cooling channel 1223, and the cooling space 1222 is connected to the second cooling channel 1223. During the rotation of the rotor 12, under the action of centrifugal force, the cooling medium in the first cooling channel 1211 enters the second cooling channel 1223 through the first through hole 1212, then enters the cooling space 1222 through the second cooling channel 1223, and finally is thrown out to the external environment of the rotor 12 through the first outlet 1225.

[0159] By adopting the above technical solution, during the rotation of rotor 12, the cooling medium can be thrown out from the first outlet 1225 to the outside of rotor body 122 under the action of centrifugal force, which facilitates the alternating flow of the cooling medium in the cooling space 1222.

[0160] In some embodiments of this application, please refer to Figure 6 The rotor body 122 has a blocking part 1226 at the first outlet 1225.

[0161] The blocking part 1226 serves to block the cooling medium flowing through the first outlet 1225.

[0162] In some embodiments, the blocking portion 1226 is connected between two opposing inner walls of the first outlet 1225 to divide the first outlet 1225 into two sub-outlets 12251, thereby reducing the flow area of ​​the first outlet 1225 and thus reducing the flow rate of the cooling medium. As an example, the number of blocking portions 1226 can be multiple to divide the first outlet 1225 into more than two sub-outlets 12251, thereby further reducing the flow rate of the cooling medium.

[0163] By adopting the above technical solution, the blocking part 1226 can play a certain blocking role on the cooling medium flowing through the first outlet 1225, effectively reducing the flow rate of the cooling medium, thereby effectively improving the situation where other parts of the rotor 12 are damaged by the impact of the cooling medium. In addition, it can also extend the residence time of the cooling medium in the cooling space 1222, so that the cooling medium can better absorb the heat of the magnet 123, further improving the cooling effect of the magnet 123, further improving the heat dissipation performance of the rotor 12, and thus further improving the working performance of the motor 10.

[0164] In some embodiments of this application, please refer to Figure 6 The first outlet 1225 is located on the outer periphery of the rotor body 122.

[0165] During the rotation of rotor 12, under the action of centrifugal force, the cooling medium in cooling space 1222 can be directly thrown out to the external environment of rotor 12 through first outlet 1225, which facilitates the discharge of cooling medium to the outside of rotor body 122.

[0166] Of course, in other embodiments, the first outlet 1225 may also be located on the end face of the rotor body 122.

[0167] Please refer to some embodiments of this application as well. Figure 8 and Figure 9 The wall of the mounting slot 1221 is provided with a third cooling channel 1224, and the internal space of the third cooling channel 1224 constitutes a cooling space 1222.

[0168] The third cooling channel 1224 provides a flow path for the cooling medium. The third cooling channel 1224 can be straight or curved. There can be one or more third cooling channels 1224. The third cooling channel 1224 can be located on any wall of the mounting groove 1221. For example, the third cooling channel 1224 is located on the bottom wall of the mounting groove 1221. For example, the third cooling channel 1224 is located on the side wall of the mounting groove 1221. For example, there can be multiple third cooling channels 1224, with at least one third cooling channel 1224 located on the bottom wall of the mounting groove 1221 and at least another third cooling channel 1224 located on the side wall of the mounting groove 1221. Understandably, the mounting groove 1221 has a slot, and the magnet 123 can be assembled into the mounting groove 1221 through the slot. The bottom wall of the mounting groove 1221 refers to the wall portion that is disposed opposite to the slot of the mounting groove 1221, and the side wall of the mounting groove 1221 refers to the wall portion that is connected to the side of the bottom wall of the mounting groove 1221.

[0169] In some embodiments, after the magnet 123 is assembled into the mounting groove 1221, the outer wall surface of the magnet 123 fits against the groove wall of the mounting groove 1221 to block the top opening of the third cooling channel 1224, thereby improving the leakage of cooling medium from the third cooling channel 1224 to the outside, and at the same time, the cooling medium can be in direct contact with the outer wall surface of the magnet 123 to absorb the heat of the magnet 123.

[0170] By adopting the above technical solution, it is easy to form a cooling space 1222 within the mounting slot 1221.

[0171] In some embodiments of this application, please refer to Figure 9 The third cooling channel 1224 has a curved structure.

[0172] The third cooling channel 1224 can be in the form of a C-shaped structure, an S-shaped structure, or other irregular curved structures.

[0173] By adopting the above technical solution, the flow rate of the cooling medium is effectively reduced, and the residence time of the cooling medium in the third cooling channel 1224 is extended, so that the cooling medium can better absorb the heat of the magnet 123, further improving the cooling effect of the magnet 123, further enhancing the heat dissipation performance of the rotor 12, and thus further improving the working performance of the motor 10.

[0174] In some embodiments of this application, please refer to Figure 10 The magnet 123 is separated from the wall of the mounting slot 1221 to form a cooling space 1222.

[0175] In some embodiments, the magnet 123 is separated from the bottom wall of the mounting groove 1221 to form the cooling space 1222.

[0176] In other embodiments, the magnet 123 is separated from the sidewall of the mounting groove 1221 to form the cooling space 1222 described above.

[0177] In some other embodiments, the magnet 123 is separated from the bottom wall of the mounting groove 1221 to form a part of the cooling space 1222, and the magnet 123 is separated from the side wall of the mounting groove 1221 to form another part of the cooling space 1222.

[0178] By adopting the above technical solution, it is easy to form a cooling space 1222 within the mounting slot 1221.

[0179] In some embodiments of this application, the outer peripheral wall of the magnet 123 is sealed to the inner peripheral wall of the mounting groove 1221.

[0180] The sealing connection between the outer peripheral wall of the magnet 123 and the inner peripheral wall of the mounting groove 1221 means that a sealing structure is provided between the outer peripheral wall of the magnet 123 and the inner peripheral wall of the mounting groove 1221 to seal the gap between the outer peripheral wall of the magnet 123 and the inner peripheral wall of the mounting groove 1221.

[0181] In some embodiments, the rotor 12 further includes a sealing ring, which is sleeved on the outer peripheral side of the magnet 123 or nested on the inner peripheral wall of the mounting groove 1221. After the magnet 123 is installed into the mounting groove 1221, the outer peripheral wall of the magnet 123 and the inner peripheral wall of the mounting groove 1221 cooperate to clamp the sealing ring, so as to seal the connection between the outer peripheral wall of the magnet 123 and the inner peripheral wall of the mounting groove 1221.

[0182] In other embodiments, a sealant is filled between the outer peripheral wall of the magnet 123 and the inner peripheral wall of the mounting groove 1221 to seal the connection between the outer peripheral wall of the magnet 123 and the inner peripheral wall of the mounting groove 1221.

[0183] By adopting the above technical solution, the leakage of cooling medium from the cooling space 1222 to the external environment of the rotor body 122 is effectively improved, the cooling effect of the magnet 123 is further improved, the heat dissipation performance of the rotor 12 is further enhanced, and thus the working performance of the motor 10 is further improved.

[0184] By adopting the above technical solution, it is easy to form a cooling space 1222 within the mounting slot 1221.

[0185] Please refer to some embodiments of this application as well. Figure 5 and Figure 11 The rotor 12 also includes a liquid collecting ring 125, which includes an annular body 1251. The annular body 1251 is sleeved on the outer periphery of the rotor body 122. The annular body 1251 has a second outlet 12511, which is used to connect the inner annular space of the annular body 1251 with the external environment of the annular body 1251.

[0186] The liquid collecting ring 125 has an annular structure and is used to collect the cooling medium ejected from the rotor body 122. The annular body 1251 is the main part of the liquid collecting ring 125 and defines the accommodating space of the rotor body 122. In some embodiments, the annular body 1251 is coaxially arranged with the rotor body 122. The material of the annular body 1251 can be, but is not limited to, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0187] The second outlet 12511 penetrates the inner and outer peripheral walls of the annular body 1251 to connect the inner annular space of the annular body 1251 with the external environment of the annular body 1251. The cooling medium thrown out from the rotor body 122 can flow from the inner annular space of the annular body 1251 to the external environment of the annular body 1251 through the second outlet 12511.

[0188] By adopting the above technical solution, it is convenient to collect the cooling medium discharged from the rotor body 122, effectively reduce the oil churning loss of the rotor 12, effectively improve the working efficiency of the motor 10, and thus further improve the working performance of the motor 10.

[0189] Please refer to some embodiments of this application as well. Figures 11 to 13 The liquid collecting ring 125 also includes an adsorption element 1252, which is attached to the inner peripheral wall of the annular body 1251 to adsorb the cooling medium.

[0190] The adsorption element 1252 is used to adsorb the cooling medium. The adsorption element 1252 can be, but is not limited to, a sponge, absorbent paper, activated carbon, etc.

[0191] In some embodiments, the adsorption member 1252 has an annular structure, and the outer peripheral wall of the adsorption member 1252 is attached to the inner peripheral wall of the annular body 1251. As an example, the adsorption member 1252 is provided with an opening that penetrates the wall of the adsorption member 1252 and is disposed opposite to the second outlet 12511, so that the cooling medium adsorbed by the adsorption member 1252 can flow out sequentially through the opening and the second outlet 12511 to the external environment of the annular body 1251.

[0192] By adopting the above technical solution, the adsorption component 1252 can adsorb the cooling medium discharged from the rotor body 122, further reduce the oil churning loss of the rotor 12, further improve the working efficiency of the motor 10, and thus further improve the working performance of the motor 10.

[0193] Please refer to some embodiments of this application as well. Figures 11 to 13 The liquid collecting ring 125 also includes a first liquid guiding structure 1253, which is disposed on the inner peripheral wall of the annular body 1251 to guide the cooling medium to the second outlet 12511.

[0194] The first liquid guiding structure 1253 provides a path for the cooling medium to flow along the inner circumferential wall of the annular body 1251, enabling the cooling medium to flow towards the second outlet 12511 along this path. Circumferentially, the first liquid guiding structure 1253 can guide the cooling medium to the second outlet 12511 in either a clockwise or counterclockwise direction. The number of first liquid guiding structures 1253 can be one or more.

[0195] In some embodiments, there are multiple first liquid guiding structures 1253. In the circumferential direction of the annular body 1251, multiple first liquid guiding structures 1253 are sequentially arranged in a counterclockwise direction to guide the cooling medium to the second outlet 12511 in a counterclockwise direction. Alternatively, multiple first liquid guiding structures 1253 are sequentially arranged in a clockwise direction to guide the cooling medium to the second outlet 12511 in a clockwise direction.

[0196] In some embodiments, the liquid collection ring 125 includes an annular body 1251 and an adsorption member 1252. The adsorption member 1252 is attached to the inner peripheral wall of the annular body 1251, and the first liquid guiding structure 1253 protrudes from the surface of the adsorption member 1252 facing away from the annular body 1251.

[0197] By adopting the above technical solution, the first liquid guiding structure 1253 can guide the cooling medium to the second outlet 12511, thereby effectively improving the discharge efficiency of the cooling medium.

[0198] In some embodiments of this application, please refer to Figure 13 The first liquid guiding structure 1253 includes a first guiding part 12531 and a second guiding part 12532. The first guiding part 12531 and the second guiding part 12532 are separated along the axial direction of the rotor 12 to form a first liquid guiding gap 12533. In the circumferential direction of the annular body 1251, the first guiding part 12531 and the second guiding part 12532 are gradually moved closer to each other in the direction of the second outlet 12511.

[0199] The first guide portion 12531 and the second guide portion 12532 cooperate to define the first liquid guiding gap 12533. The first guide portion 12531 and the second guide portion 12532 can be strip-shaped or plate-shaped.

[0200] In the circumferential direction of the annular body 1251, the first guide portion 12531 and the second guide portion 12532 are arranged to gradually move closer to the second outlet 12511. This means that when the first liquid guiding structure 1253 guides the cooling medium to the second outlet 12511 in a counterclockwise direction, the distance between the first guide portion 12531 and the second guide portion 12532 along the axial direction of the rotor 12 gradually decreases in a counterclockwise direction. When the first liquid guiding structure 1253 guides the cooling medium to the second outlet 12511 in a clockwise direction, the distance between the first guide portion 12531 and the second guide portion 12532 along the axial direction of the rotor 12 gradually decreases in a clockwise direction. This results in the first liquid guiding structure 1253 forming a flared opening on the side away from the second outlet 12511 and a constricted opening on the side of the first liquid guiding structure 1253 closer to the second outlet 12511.

[0201] By adopting the above technical solution, the structure of the first liquid guiding structure 1253 is effectively simplified, making it easier to guide the cooling medium to the second outlet 12511.

[0202] Please refer to some embodiments of this application as well. Figures 11 to 13 The liquid collecting ring 125 also includes a second liquid guiding structure 1254. The second liquid guiding structure 1254 is disposed on the inner peripheral wall of the annular body 1251 and located on the side of the second outlet 12511 facing away from the first liquid guiding structure 1253. The first liquid guiding structure 1253 is used to guide a portion of the cooling medium to the second outlet 12511, and the second liquid guiding structure 1254 is used to guide another portion of the cooling medium to the second outlet 12511.

[0203] The second liquid guiding structure 1254 provides a path for the cooling medium to flow along the inner circumferential wall of the annular body 1251, enabling the cooling medium to flow towards the second outlet 12511 along this path. In the circumferential direction of the annular body 1251, the first liquid guiding structure 1253 can guide the cooling medium to the second outlet 12511 in a counterclockwise direction, and the second liquid guiding structure 1254 can guide the cooling medium to the second outlet 12511 in a clockwise direction; alternatively, in the circumferential direction of the annular body 1251, the first liquid guiding structure 1253 can guide the cooling medium to the second outlet 12511 in a clockwise direction, and the second liquid guiding structure 1254 can guide the cooling medium to the second outlet 12511 in a counterclockwise direction. The number of second liquid guiding structures 1254 can be one or more.

[0204] In some embodiments, there are multiple first liquid guiding structures 1253 and multiple second liquid guiding structures 1254. Around the circumference of the annular body 1251, multiple first liquid guiding structures 1253 are sequentially arranged in a counter-clockwise direction to guide a portion of the cooling medium to the second outlet 12511 in a counter-clockwise direction, and multiple second liquid guiding structures 1254 are sequentially arranged in a clockwise direction to guide another portion of the cooling medium to the second outlet 12511 in a clockwise direction. Alternatively, around the circumference of the annular body 1251, multiple first liquid guiding structures 1253 are sequentially arranged in a clockwise direction to guide a portion of the cooling medium to the second outlet 12511 in a clockwise direction, and multiple second liquid guiding structures 1254 are sequentially arranged in a counter-clockwise direction to guide another portion of the cooling medium to the second outlet 12511 in a counter-clockwise direction.

[0205] In some embodiments, the liquid collecting ring 125 includes an annular body 1251 and an adsorption member 1252. The adsorption member 1252 is attached to the inner peripheral wall of the annular body 1251, and the first liquid guiding structure 1253 and the second liquid guiding structure 1254 are both protruding on the surface of the adsorption member 1252 facing away from the annular body 1251.

[0206] By adopting the above technical solution, the cooling medium is guided to the second outlet 12511 more effectively, thereby further improving the discharge efficiency of the cooling medium.

[0207] In some embodiments of this application, the second liquid guiding structure 1254 includes a third guiding portion and a fourth guiding portion. The third guiding portion and the fourth guiding portion are separated along the axial direction of the rotor 12 to form a second liquid guiding gap. In the circumferential direction of the annular body 1251, the third guiding portion and the fourth guiding portion are gradually arranged closer to each other in the direction of the second outlet 12511.

[0208] The third and fourth guiding sections work together to define the second fluid guiding gap. The third and fourth guiding sections can be strip-shaped or plate-shaped.

[0209] In the circumferential direction of the annular body 1251, the third guide portion and the fourth guide portion are arranged to gradually move closer to the second outlet 12511. This means that when the second liquid guiding structure 1254 guides the cooling medium to the second outlet 12511 in a counterclockwise direction, the distance between the third guide portion and the fourth guide portion along the axial direction of the rotor 12 gradually decreases in a counterclockwise direction. When the second liquid guiding structure 1254 guides the cooling medium to the second outlet 12511 in a clockwise direction, the distance between the third guide portion and the fourth guide portion along the axial direction of the rotor 12 gradually decreases in a clockwise direction. This results in the second liquid guiding structure 1254 forming a flared opening on the side away from the second outlet 12511 and a constricted opening on the side of the second liquid guiding structure 1254 closer to the second outlet 12511.

[0210] By adopting the above technical solution, the structure of the second liquid guiding structure 1254 is effectively simplified, making it easier to guide the cooling medium to the second outlet 12511.

[0211] Please refer to some embodiments of this application as well. Figures 11 to 13 The second outlet 12511 is located at the bottom of the annular body 1251.

[0212] The top and bottom of the annular body 1251 can be two parts of the annular body 1251 divided by a reference plane that coincides with the central axis of the annular body 1251 and is parallel to the ground plane. The bottom of the annular body 1251 refers to the part of the annular body 1251 that is closest to the ground plane, and the top of the annular body 1251 refers to the part of the annular body 1251 that is farthest from the ground plane.

[0213] By adopting the above technical solution, the cooling medium can flow to the second outlet 12511 under its own gravity, thereby further improving the discharge efficiency of the cooling medium.

[0214] Secondly, please refer to the following: Figure 4 and Figure 5 This application provides an electric motor 10, which includes the rotor 12 described in any of the above embodiments.

[0215] The motor 10 provided in this application embodiment effectively improves the working performance of the motor 10 by adopting the rotor 12 described in any of the above embodiments.

[0216] In some embodiments, please refer to Figure 5 The motor 10 also includes a housing 11 and a stator 13. The housing 11 has a cavity 111 for accommodating the stator 13 and the rotor 12. The stator 13 is magnetically coupled to the rotor 12. As an example, there are two stators 13, which are located on opposite sides of the rotor 12 along the axial direction of the motor 10.

[0217] Thirdly, please refer to Figure 3 This application provides an electric drive device 1, which includes the motor 10 described above.

[0218] The electric drive device 1 provided in this application embodiment effectively improves the working performance of the electric drive device 1 by adopting the above-mentioned motor 10.

[0219] Fourthly, please refer to Figure 1 This application provides an electric drive system, including a battery 2 and the aforementioned electric drive device 1, wherein the battery 2 is electrically connected to the motor 10.

[0220] The electric drive system provided in this application embodiment effectively improves the working performance of the electric drive system by adopting the above-mentioned electric drive device 1.

[0221] Fifthly, please refer to Figure 1 This application provides an electric device, including the electric drive device 1 or the electric drive system described above.

[0222] The electric equipment provided in this application embodiment effectively improves the working performance of the electric equipment by adopting the above-mentioned electric drive device 1 or the above-mentioned electric drive system.

[0223] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A rotor, characterized in that, The rotor includes: Shaft; The rotor body is coaxially connected to the rotating shaft, and the rotor body is provided with a mounting groove; The magnet is installed in the mounting slot; At least a portion of the space in the mounting slot constitutes a cooling space, which is used to contain a cooling medium so that the magnet comes into contact with the cooling medium.

2. The rotor as claimed in claim 1, characterized in that, The rotor has an input channel that connects to the cooling space to deliver the cooling medium into the cooling space.

3. The rotor as described in claim 2, characterized in that, The input channel includes a first cooling channel formed inside the rotating shaft.

4. The rotor as described in claim 3, characterized in that, The input channel further includes a second cooling channel, which is formed inside the rotor body and serves to connect the first cooling channel and the cooling space.

5. The rotor as described in claim 4, characterized in that, The input channel also includes a first through hole, which is formed on the wall of the rotating shaft and is used to connect the first cooling channel and the second cooling channel.

6. The rotor as described in any one of claims 3-5, characterized in that, The wall of the rotating shaft is provided with a second through hole, which is used to connect the first cooling channel and the external environment of the rotor. The rotor also includes a spray member, which is installed in the second through hole to spray the cooling medium located in the first cooling channel onto the outer surface of the magnet.

7. The rotor as claimed in claim 6, characterized in that, The spraying element is an atomizing nozzle.

8. The rotor as claimed in claim 6 or 7, characterized in that, The second through hole is located on the axial side of the rotor body.

9. The rotor according to any one of claims 1-8, characterized in that, The rotor body has a first outlet, which is used to connect the cooling space and the external environment of the rotor.

10. The rotor as claimed in claim 9, characterized in that, The rotor body has a blocking part at the first outlet.

11. The rotor as claimed in claim 9 or 10, characterized in that, The first outlet is located on the outer periphery of the rotor body.

12. The rotor according to any one of claims 1-11, characterized in that, The mounting groove has a third cooling channel in its wall, and the internal space of the third cooling channel constitutes the cooling space.

13. The rotor as claimed in claim 12, characterized in that, The third cooling channel has a curved structure.

14. The rotor as claimed in claim 12 or 13, characterized in that, The third cooling channel is recessed into the bottom wall of the mounting groove; and / or, The third cooling channel is recessed into the side wall of the mounting groove.

15. The rotor according to any one of claims 1-11, characterized in that, The magnet is separated from the wall of the mounting slot to form the cooling space.

16. The rotor as claimed in claim 15, characterized in that, The outer peripheral wall of the magnet is sealed to the inner peripheral wall of the mounting groove.

17. The rotor as claimed in claim 15 or 16, characterized in that, The magnet is separated from the bottom wall of the mounting slot to form at least a portion of the cooling space; and / or, The magnet is separated from the sidewall of the mounting slot to form at least a portion of the cooling space.

18. The rotor according to any one of claims 1-17, characterized in that, The rotor also includes a liquid collecting ring, which includes an annular body. The annular body is sleeved on the outer periphery of the rotor body. The annular body has a second outlet, which is used to connect the inner annular space of the annular body with the external environment of the annular body.

19. The rotor as claimed in claim 18, characterized in that, The liquid collecting ring also includes an adsorption element, which is attached to the inner peripheral wall of the annular body to adsorb the cooling medium.

20. The rotor as described in claim 18 or 19, characterized in that, The liquid collecting ring also includes a first liquid guiding structure, which is disposed on the inner peripheral wall of the annular body to guide the cooling medium to the second outlet.

21. The rotor as claimed in claim 20, characterized in that, The first liquid guiding structure includes a first guiding part and a second guiding part. The first guiding part and the second guiding part are separated along the axial direction of the rotor to form a first liquid guiding gap. In the circumferential direction of the annular body, the first guiding part and the second guiding part are gradually moved closer to each other in the direction of the second outlet.

22. The rotor as claimed in claim 20 or 21, characterized in that, The number of the first liquid guiding structures is multiple, and the multiple first liquid guiding structures are arranged sequentially along the circumference of the annular body.

23. The rotor according to any one of claims 20-22, characterized in that, The liquid collecting ring further includes a second liquid guiding structure, which is disposed on the inner peripheral wall of the ring body and located on the side of the second outlet opposite to the first liquid guiding structure. The first liquid guiding structure is used to guide a portion of the cooling medium to the second outlet, and the second liquid guiding structure is used to guide another portion of the cooling medium to the second outlet.

24. The rotor as claimed in claim 23, characterized in that, The second liquid guiding structure includes a third guiding part and a fourth guiding part. The third guiding part and the fourth guiding part are separated along the axial direction of the rotor to form a second liquid guiding gap. In the circumferential direction of the annular body, the third guiding part and the fourth guiding part are gradually arranged closer to each other in the direction of the second outlet.

25. The rotor as claimed in claim 23 or 24, characterized in that, The number of the second liquid guiding structures is multiple, and the multiple second liquid guiding structures are arranged sequentially around the circumference of the annular body.

26. The rotor as claimed in any one of claims 18-25, characterized in that, The second outlet is located at the bottom of the annular body.

27. An electric motor, characterized in that, The motor includes a rotor as described in any one of claims 1-26.

28. An electric drive device, characterized in that, The electric drive device includes the motor as described in claim 27.

29. An electric drive system, characterized in that, The electric drive system includes a battery and an electric drive device as described in claim 28, wherein the battery is electrically connected to the motor.

30. An electric device, characterized in that, The electric device includes the electric drive device as described in claim 28 or the electric drive system as described in claim 29.

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